Linux kernel mirror (for testing)
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linux
1#ifndef _ASM_SCORE_PGTABLE_H
2#define _ASM_SCORE_PGTABLE_H
3
4#include <linux/const.h>
5#include <asm-generic/pgtable-nopmd.h>
6
7#include <asm/fixmap.h>
8#include <asm/setup.h>
9#include <asm/pgtable-bits.h>
10
11extern void load_pgd(unsigned long pg_dir);
12extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
13
14/* PGDIR_SHIFT determines what a third-level page table entry can map */
15#define PGDIR_SHIFT 22
16#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
17#define PGDIR_MASK (~(PGDIR_SIZE - 1))
18
19/*
20 * Entries per page directory level: we use two-level, so
21 * we don't really have any PUD/PMD directory physically.
22 */
23#define PGD_ORDER 0
24#define PTE_ORDER 0
25
26#define PTRS_PER_PGD 1024
27#define PTRS_PER_PTE 1024
28
29#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
30#define FIRST_USER_ADDRESS 0
31
32#define VMALLOC_START (0xc0000000UL)
33
34#define PKMAP_BASE (0xfd000000UL)
35
36#define VMALLOC_END (FIXADDR_START - 2*PAGE_SIZE)
37
38#define pte_ERROR(e) \
39 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
40 __FILE__, __LINE__, pte_val(e))
41#define pgd_ERROR(e) \
42 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
43 __FILE__, __LINE__, pgd_val(e))
44
45/*
46 * Empty pgd/pmd entries point to the invalid_pte_table.
47 */
48static inline int pmd_none(pmd_t pmd)
49{
50 return pmd_val(pmd) == (unsigned long) invalid_pte_table;
51}
52
53#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
54
55static inline int pmd_present(pmd_t pmd)
56{
57 return pmd_val(pmd) != (unsigned long) invalid_pte_table;
58}
59
60static inline void pmd_clear(pmd_t *pmdp)
61{
62 pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
63}
64
65#define pte_page(x) pfn_to_page(pte_pfn(x))
66#define pte_pfn(x) ((unsigned long)((x).pte >> PAGE_SHIFT))
67#define pfn_pte(pfn, prot) \
68 __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
69
70#define __pgd_offset(address) pgd_index(address)
71#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
72#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
73
74/* to find an entry in a kernel page-table-directory */
75#define pgd_offset_k(address) pgd_offset(&init_mm, address)
76#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
77
78/* to find an entry in a page-table-directory */
79#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
80
81/* Find an entry in the third-level page table.. */
82#define __pte_offset(address) \
83 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
84#define pte_offset(dir, address) \
85 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
86#define pte_offset_kernel(dir, address) \
87 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
88
89#define pte_offset_map(dir, address) \
90 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
91#define pte_unmap(pte) ((void)(pte))
92
93/*
94 * Bits 9(_PAGE_PRESENT) and 10(_PAGE_FILE)are taken,
95 * split up 30 bits of offset into this range:
96 */
97#define PTE_FILE_MAX_BITS 30
98#define pte_to_pgoff(_pte) \
99 (((_pte).pte & 0x1ff) | (((_pte).pte >> 11) << 9))
100#define pgoff_to_pte(off) \
101 ((pte_t) {((off) & 0x1ff) | (((off) >> 9) << 11) | _PAGE_FILE})
102#define __pte_to_swp_entry(pte) \
103 ((swp_entry_t) { pte_val(pte)})
104#define __swp_entry_to_pte(x) ((pte_t) {(x).val})
105
106#define pmd_phys(pmd) __pa((void *)pmd_val(pmd))
107#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
108#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
109static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
110
111#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
112#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
113#define pte_clear(mm, addr, xp) \
114 do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
115
116#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
117 remap_pfn_range(vma, vaddr, pfn, size, prot)
118
119/*
120 * The "pgd_xxx()" functions here are trivial for a folded two-level
121 * setup: the pgd is never bad, and a pmd always exists (as it's folded
122 * into the pgd entry)
123 */
124#define pgd_present(pgd) (1)
125#define pgd_none(pgd) (0)
126#define pgd_bad(pgd) (0)
127#define pgd_clear(pgdp) do { } while (0)
128
129#define kern_addr_valid(addr) (1)
130#define pmd_page_vaddr(pmd) pmd_val(pmd)
131
132#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
133#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
134
135#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
136#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
137 _PAGE_CACHE)
138#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
139#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
140#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
141 _PAGE_GLOBAL | _PAGE_CACHE)
142#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
143 __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
144
145#define __P000 PAGE_NONE
146#define __P001 PAGE_READONLY
147#define __P010 PAGE_COPY
148#define __P011 PAGE_COPY
149#define __P100 PAGE_READONLY
150#define __P101 PAGE_READONLY
151#define __P110 PAGE_COPY
152#define __P111 PAGE_COPY
153
154#define __S000 PAGE_NONE
155#define __S001 PAGE_READONLY
156#define __S010 PAGE_SHARED
157#define __S011 PAGE_SHARED
158#define __S100 PAGE_READONLY
159#define __S101 PAGE_READONLY
160#define __S110 PAGE_SHARED
161#define __S111 PAGE_SHARED
162
163#define pgprot_noncached pgprot_noncached
164
165static inline pgprot_t pgprot_noncached(pgprot_t _prot)
166{
167 unsigned long prot = pgprot_val(_prot);
168
169 prot = (prot & ~_CACHE_MASK);
170
171 return __pgprot(prot);
172}
173
174#define __swp_type(x) ((x).val & 0x1f)
175#define __swp_offset(x) ((x).val >> 11)
176#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 11)})
177
178extern unsigned long empty_zero_page;
179extern unsigned long zero_page_mask;
180
181#define ZERO_PAGE(vaddr) \
182 (virt_to_page((void *)(empty_zero_page + \
183 (((unsigned long)(vaddr)) & zero_page_mask))))
184
185#define pgtable_cache_init() do {} while (0)
186
187#define arch_enter_lazy_cpu_mode() do {} while (0)
188
189static inline int pte_write(pte_t pte)
190{
191 return pte_val(pte) & _PAGE_WRITE;
192}
193
194static inline int pte_dirty(pte_t pte)
195{
196 return pte_val(pte) & _PAGE_MODIFIED;
197}
198
199static inline int pte_young(pte_t pte)
200{
201 return pte_val(pte) & _PAGE_ACCESSED;
202}
203
204static inline int pte_file(pte_t pte)
205{
206 return pte_val(pte) & _PAGE_FILE;
207}
208
209#define pte_special(pte) (0)
210
211static inline pte_t pte_wrprotect(pte_t pte)
212{
213 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
214 return pte;
215}
216
217static inline pte_t pte_mkclean(pte_t pte)
218{
219 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
220 return pte;
221}
222
223static inline pte_t pte_mkold(pte_t pte)
224{
225 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
226 return pte;
227}
228
229static inline pte_t pte_mkwrite(pte_t pte)
230{
231 pte_val(pte) |= _PAGE_WRITE;
232 if (pte_val(pte) & _PAGE_MODIFIED)
233 pte_val(pte) |= _PAGE_SILENT_WRITE;
234 return pte;
235}
236
237static inline pte_t pte_mkdirty(pte_t pte)
238{
239 pte_val(pte) |= _PAGE_MODIFIED;
240 if (pte_val(pte) & _PAGE_WRITE)
241 pte_val(pte) |= _PAGE_SILENT_WRITE;
242 return pte;
243}
244
245static inline pte_t pte_mkyoung(pte_t pte)
246{
247 pte_val(pte) |= _PAGE_ACCESSED;
248 if (pte_val(pte) & _PAGE_READ)
249 pte_val(pte) |= _PAGE_SILENT_READ;
250 return pte;
251}
252
253#define set_pmd(pmdptr, pmdval) \
254 do { *(pmdptr) = (pmdval); } while (0)
255#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
256
257extern unsigned long pgd_current;
258extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
259extern void paging_init(void);
260
261static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
262{
263 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
264}
265
266extern void __update_tlb(struct vm_area_struct *vma,
267 unsigned long address, pte_t pte);
268extern void __update_cache(struct vm_area_struct *vma,
269 unsigned long address, pte_t pte);
270
271static inline void update_mmu_cache(struct vm_area_struct *vma,
272 unsigned long address, pte_t *ptep)
273{
274 pte_t pte = *ptep;
275 __update_tlb(vma, address, pte);
276 __update_cache(vma, address, pte);
277}
278
279#ifndef __ASSEMBLY__
280#include <asm-generic/pgtable.h>
281
282void setup_memory(void);
283#endif /* __ASSEMBLY__ */
284
285#endif /* _ASM_SCORE_PGTABLE_H */